[#323] client: Refactor object.GetRange

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

client/object_get.go

@@ -480,6 +480,8 @@ func (c *Client) ObjectHead(ctx context.Context, prm PrmObjectHead) (*ResObjectH
 type PrmObjectRange struct {
 	prmObjectRead
 
+	key *ecdsa.PrivateKey
+
 	rng v2object.Range
 }
 
@@ -495,6 +497,12 @@ func (x *PrmObjectRange) SetLength(ln uint64) {
 	x.rng.SetLength(ln)
 }
 
+// UseKey specifies private key to sign the requests.
+// If key is not provided, then Client default key is used.
+func (x *PrmObjectRange) UseKey(key ecdsa.PrivateKey) {
+	x.key = &key
+}
+
 // ResObjectRange groups the final result values of ObjectRange operation.
 type ResObjectRange struct {
 	statusRes
@@ -508,33 +516,21 @@ type ResObjectRange struct {
 type ObjectRangeReader struct {
 	cancelCtxStream context.CancelFunc
 
-	ctxCall contextCall
+	client *Client
 
-	reqWritten bool
+	res ResObjectRange
+	err error
 
-	// initially bound to contextCall
+	stream interface {
-	bodyResp v2object.GetRangeResponseBody
+		Read(resp *v2object.GetRangeResponse) error
+	}
 
 	tailPayload []byte
 
 	remainingPayloadLen int
 }
 
-// UseKey specifies private key to sign the requests.
-// If key is not provided, then Client default key is used.
-func (x *ObjectRangeReader) UseKey(key ecdsa.PrivateKey) {
-	x.ctxCall.key = key
-}
-
 func (x *ObjectRangeReader) readChunk(buf []byte) (int, bool) {
-	if !x.reqWritten {
-		if !x.ctxCall.writeRequest() {
-			return 0, false
-		}
-
-		x.reqWritten = true
-	}
-
 	var read int
 
 	// read remaining tail
@@ -546,25 +542,29 @@ func (x *ObjectRangeReader) readChunk(buf []byte) (int, bool) {
 		return read, true
 	}
 
-	var ok bool
 	var partChunk *v2object.GetRangePartChunk
 	var chunk []byte
 	var lastRead int
 
 	for {
-		// receive next message
+		var resp v2object.GetRangeResponse
-		ok = x.ctxCall.readResponse()
+		x.err = x.stream.Read(&resp)
-		if !ok {
+		if x.err != nil {
+			return read, false
+		}
+
+		x.res.st, x.err = x.client.processResponse(&resp)
+		if x.err != nil || !apistatus.IsSuccessful(x.res.st) {
 			return read, false
 		}
 
 		// get chunk message
-		switch v := x.bodyResp.GetRangePart().(type) {
+		switch v := resp.GetBody().GetRangePart().(type) {
 		default:
-			x.ctxCall.err = fmt.Errorf("unexpected message received: %T", v)
+			x.err = fmt.Errorf("unexpected message received: %T", v)
 			return read, false
 		case *v2object.SplitInfo:
-			handleSplitInfo(&x.ctxCall, v)
+			x.err = object.NewSplitInfoError(object.NewSplitInfoFromV2(v))
 			return read, false
 		case *v2object.GetRangePartChunk:
 			partChunk = v
@@ -600,9 +600,9 @@ func (x *ObjectRangeReader) ReadChunk(buf []byte) (int, bool) {
 func (x *ObjectRangeReader) close(ignoreEOF bool) (*ResObjectRange, error) {
 	defer x.cancelCtxStream()
 
-	if x.ctxCall.err != nil {
+	if x.err != nil {
-		if !errors.Is(x.ctxCall.err, io.EOF) {
+		if !errors.Is(x.err, io.EOF) {
-			return nil, x.ctxCall.err
+			return nil, x.err
 		} else if !ignoreEOF {
 			if x.remainingPayloadLen > 0 {
 				return nil, io.ErrUnexpectedEOF
@@ -612,7 +612,7 @@ func (x *ObjectRangeReader) close(ignoreEOF bool) (*ResObjectRange, error) {
 		}
 	}
 
-	return x.ctxCall.statusRes.(*ResObjectRange), nil
+	return &x.res, nil
 }
 
 // Close ends reading the payload range and returns the result of the operation
@@ -693,39 +693,21 @@ func (c *Client) ObjectRangeInit(ctx context.Context, prm PrmObjectRange) (*Obje
 	var req v2object.GetRangeRequest
 
 	req.SetBody(&body)
-	req.SetMetaHeader(&prm.meta)
+	c.prepareRequest(&req, &prm.meta)
 
-	// init reader
+	ctx, cancel := context.WithCancel(ctx)
-	var (
-		r      ObjectRangeReader
-		resp   v2object.GetRangeResponse
-		stream *rpcapi.ObjectRangeResponseReader
-	)
 
-	r.remainingPayloadLen = int(prm.rng.GetLength())
+	stream, err := rpcapi.GetObjectRange(&c.c, &req, client.WithContext(ctx))
-
-	ctx, r.cancelCtxStream = context.WithCancel(ctx)
-
-	resp.SetBody(&r.bodyResp)
-
-	// init call context
-	c.initCallContext(&r.ctxCall)
-	r.ctxCall.req = &req
-	r.ctxCall.statusRes = new(ResObjectRange)
-	r.ctxCall.resp = &resp
-	r.ctxCall.wReq = func() error {
-		var err error
-
-		stream, err = rpcapi.GetObjectRange(&c.c, &req, client.WithContext(ctx))
 	if err != nil {
-			return fmt.Errorf("open stream: %w", err)
+		cancel()
+		return nil, fmt.Errorf("open stream: %w", err)
 	}
 
-		return nil
+	var r ObjectRangeReader
-	}
+	r.remainingPayloadLen = int(prm.rng.GetLength())
-	r.ctxCall.rResp = func() error {
+	r.cancelCtxStream = cancel
-		return stream.Read(&resp)
+	r.stream = stream
-	}
+	r.client = c
 
 	return &r, nil
 }

pool/pool.go

@@ -684,15 +684,16 @@ func (c *clientWrapper) objectRange(ctx context.Context, prm PrmObjectRange) (Re
 		cliPrm.WithBearerToken(*prm.btoken)
 	}
 
+	if prm.key != nil {
+		cliPrm.UseKey(*prm.key)
+	}
+
 	start := time.Now()
 	res, err := c.client.ObjectRangeInit(ctx, cliPrm)
 	c.incRequests(time.Since(start), methodObjectRange)
 	if err = c.handleError(nil, err); err != nil {
 		return ResObjectRange{}, fmt.Errorf("init payload range reading on client: %w", err)
 	}
-	if prm.key != nil {
-		res.UseKey(*prm.key)
-	}
 
 	return ResObjectRange{
 		payload: res,